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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '040a45f4de58590c216c779df8e37abb32eab45172f3ab1f7f21bcfb7f6d92b5' 
  AND token = 'etntG06u/aKi4zJrIJ3t6r720ZPgGzoBQDIPdQiBoig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}